Pump-jack for double-acting pumps.



P. W. AXTELL.

PUMP JACK ma DOUBLE ACTING PUMPS.

APPLIOATION FILED NOV. 8, 1911.

1,024,921 Patented Apr. 30, 1912.

2 BHBETSSHEET 1.

P. W. AXTELL.

PUMP JACK FOR DOUBLE ACTING PUMPS.

'APPLIGATION FILED NOV. 8, 1911.

Patented Apr. 30, 1912.

2 SHEETSSHEET 2.

INVENTOR 2 5 MW WITNESSES FRED W. .AXTELL, OF FORT WORTH, TEXAS-PUMP-J'ACK FORYDOUBL-E AGTING PUMPS.

To all whom it may concern:

Be it knownthat I, FRED W. AX'I'ELL, a citizen of the United States,residing at Fort Worth, in the county of Tarrantand State of Texas, haveinvented certain new 'and useful Improvements in. Pump-Jacks forDouble-Acting Pumps, of which the following is 'a specification.

This invention relates to pump jacks for double acting pumps, and theobject is to provide a pump jack which is double geared, heavy, andcompactly built, requiring very little floor space, and especiallyadapted for.

. heavy duty.

Another object is to provide the pump with forged steel pitmen with bentand machine turned ends which work in bronze bearings at both ends whichare easily removed, inexpensive and interchangeable and in which thecenter of the bearing is in line with a plane which runs through thevertical center of the gear wheel and pinion for preventing crossstrain.

Another object is to provide an improved base for supporting and holdingthe working parts securely in operative relation and to provide. rifledsockets for the upright guide rods in the base.

Another object is to provide bearings for the drive wheel that areeff-set relative to the center of the cross heads which drive the pistonrods whereby agreat advantage is obtained in operating power.

Another advantage is thatpthepiston is attached to the middle of thecross head in such manner as to give a parallel movement of the same,reducing the stufiing box friction to a minimum.

Other objects and advantages will be fully explained in the followingdescription and the invention will be more particularly pointed-outinthe claims. I

Reference is had to the accompanying drawings which form a part of thisapplication.

Figure 1 is a rear elevation of the pump jack, complete; Fig. 2 is aside elevation of the pump jack, the drive pulley being shown only indotted outline; Fig. 3 is an end View of a bronze bearing for a crosshead; Fig. 4 is a section of a similar bearing in the drive wheel; Fig.5 are detail viewss, being an edge and a side view of the dog used intheeuniversal pipe centering device; Fig. 6'

is a plan view of a universal pipe centerer;

Fig. 7 is a view of the lower end of one of Specification of LettersPatent. Application filed November 8, 1911. Serial No. 859,232.

REISSUED Patented Apr. 30, .1912.

the guide rods; Fig. 8 is:asectio'n of one of the sockets for the guiderods; Fig. 9-is a plan view of the entire base with all working partsomitted; Fig. 10'is a side elevation of the same; Fig. 11 is a verticalsection of the base taken on the line wm of Fig. 9,

several views.

The jack is provided with a base which.

is composed of two trough like castings and each casting is composed ofouter walls 1 and inner walls 2 and end walls 4 and with a bottom 3which is integral with the side and end walls. The walls 1'-1 and 2-2constitute the bearing walls for the driving gear and also the bearingwalls for the piston driving gear. 7

The castings are provided with flanges 5 and on the front ends of thecastings are formed vertical sockets 6. The two castings are rigidlyconnected together by a curved flange casting 7 which has flanges 8,riveted to the inner walls 2 of the bearing castings. The bearing walls.1--1 are provided withbearings 10 and the bearing walls 2'2 are providedwith bearings 11 for the shafts of the piston driving wheels and for thecrank disks. These bearing walls are also provided with bearings 9 forthe main driving shaft. The inner walls 2 have cut outs 12 and 13 forthe arms 15 which are integral with the pipe centerer. 14. The arms 15of this pipe centerer are placed under the ends of the castings so thatwhen the castings are bolted down to the base timbers the pipe centererwill be held rigidly in place. The shaft 18 which is the main drivingshaft is journaled in the bearings 9. The bearing walls have cars 16cast integral therewithto receive the ends of the braces 28 and 29. 'Thebraces 28 are inserted in the ears 16 of the outer walls 1 and insockets formed in the tie bar 1 25'. The braces 29 are inserted at thelower ends in the cars 16 of the inner walls 2 and in clips 29' whichare secured to the central uprights 24 at points which are not reached36. The cross head 21 is uided in its vertical movement by the guiderods 24 which omitting the pipe centerer; and, Fig. 12 is a I verticalsection taken on the-line yy of are rifled in the sockets 6 and securedin sockets in. the tie bar 25'. The cross head 22 is guided in itsvertical movement by the guide rods 28 and 24: which are rifled in thesockets 6 and secured in sockets in the tie bar 25'. A stuffing box 37is mounted on the cross head 21 for the piston 36.

Pinions 27 are'mounted rigidly on shaft 18 and drive the gear wheels 26which are mounted on shafts 18. The shaft 18 is pro- 1 and the bushingsare inserted in the bearings '25 with the lugs also embedded inthebearings The center of the bearings 25 is in line with the plane whichruns vertically through the center of the gear wheel 26 and pinion 27 sothat there will be no cross strain of the pitman rod 19., The cross head21 is driven by pitman rods 20 which are similar to pitman rods 19 andthe pit man rods 20 are pivotally connectedto crank disks 20, Thesedisks are rigid with shatts llY/and consequently the disks are driven bythe power from the gear Wheels 26 which power is transmitted by means ofthe shat s 18,

The bearings 11 of the bearing walls 2 and the bearings 10 ot thebearing walls 1 are ofi -set relative to the centers of the verticalguide rods 2d and 28 and consequently the vertical centers of the crossheads for the purpose of securing greater power from the drive wheels.By reason of this arrangement of the od-set bearings approximately 17%more time is required to make the up stroke of the piston rods than thedown. stroke, thus reducing the strain on the lifting parts in the sameratio as the strain is less on this plan than if the time were dividedequally between the down stroke and the up stroke as is common in otherpump jacks. This means the time'of one revolution of the driving gean isa furtheradvantage of getting a quick return of the down stroke inpermitting the valves to close quicker, llt also permits the valves tostart slower increasing in speed after they are in motion by which thebest possible result is obtained and which is not possible when the timeof the stroke is evenly divided between the up and down stroke.

} The universal pipe centerer consists of a cylindrical casting 14L witharms 15 which have ribs integral therewith and which proiect up to thetop ofthe castings, Sock'em 3? are tanned in the casting 1e and in theseThere roaaesr sockets are pivoted dogs which have lugs 39 projectinginto Vertical grooves in the walls of the sockets 37. The dogs 38 willthus swing inwardly at the free ends and engage the pipe 40 by which thepipe can be accurately centered. The dogs 38 are pivotally mounted byreason of the lugs 39 which project into the grooves in the walls of thesockets 37.

Having fully described my invention, whatT claim as new and desire tosecure by Letters Patent, is

1. A pump-jack for double acting pumps comprising a baseconsisting oftwo bearing members each having two bearing walls formed of anv integralstructure and a curved flanged binding member bolted to each of saidmembers and making said members rigid witheach other, the "front ends ofsaid bearing members having four sockets formed therein in alinemcntwith. each other, four vertical guide rods rifled in said sockets, aninterior piston cross-head adapted to move vertically on all of saidguide rods, an exterior piston cross-head adapted to move vertically onthe two central guide rods, gear wheels for driving said interior piston'crosshead having shafts journaled in the exterior walls of said bearingmembers V and pitmen operatively connecting said cross-head with saidgear wheels, crank disks for driving said exterior piston crossheadoperated by said gear wheels, and pitmen operatively connecting saidcross-head and said disks, and means for driving said gear wheels, v

2. A pump-jack having .a rigid base consisting of two pairs of walls,each pair having an integral connection at the ends and throughout thebottoms thereof, constituting bearing walls and means for making saidbearing walls rigid with each other, sockets for guide rods being formedin said walls, vertical guide rods rigid in said sockets, cross-headsadapted to move on said guide rods, gearing and pitman rods operativelyconnected with said gearing and with said cross-heads, shafts for saidgearing and bearings for said shafts ofi set in said bearing wallsrelative to the centers of said iiide rods and cross-heads.

3. pump-jack having a base consisting of two bearing members rigid witheach other and each having two bearing walls, the front ends of saidwalls having sockets formed therein, four parallel vertical guide rodsrifled in'said sockets, an interior piston cross-head adapted to move onall of said guide rods, an exterior piston cross-head adapted to move onthe two central guide rods,.gear wheels and pit-men for driving saidinterior piston cross-head, shafts for driving the said gear wheelsjournaled in the exterior walls of said bearing members, crank disks andpit'men for driving said exterior piston cross-head, a pair of disksbeing connected to each pitman, the exterior disk for each pitman beingrigid with the shaft of the adjacent gear wheel, a shaft for theinterior disks journaled in the interior walls of said bearing members,a shaft journaled in all of said walls, and gearing on said shaft fordriving said gear wheels, and means for driving said shaft.

4. A pump-jack having a base consisting of four rigid parallel bearingwalls having sockets formed in the front ends thereof,v

four parallel guide rods rifled in said sockets and a tie-bar connectedto the upper ends of the guide rods, an interior piston crossheadadapted to move on all of said rods, an exterior piston cross-headadapted to move on the two central guide rods, pitmen and gearingoperatively connected with said cross-heads and with said bearing wallsfor moving said cross-heads, braces for the tw exterior guide rodsrigidly connected to said tie-bar and to the rear ends of the exteriorbearing walls, and braces for the two interior guide rods rigidlyconnected thereto at points between the travel of said crossheads and tothe rear ends of the interior bearing walls.

5. A pump-jack having a rigid base consisting of bearing walls and meansfor making said walls rigid with each other, sockets for guide rodsformed in said bearing walls,

vertical guide rods rigid in said sockets,

cross-heads adapted to move on said guide rods, gearing and pitman rodsoperatively connected with said gearing and said crossheads, shafts forsaid gearing journaled in said bearing Walls, means for driving saidgearing, and a pipe centerer at the front end of the pump-jackconsisting of a vertical cylinder having laterally extending arms.

projected under the two adjacent bearing walls, said bearing wallshaving cutouts thereunder to receive said arms, and dogs pivotallymounted in said cylinder for engaging the pipe. 4

6; A pump jack consisting of bearing walls and means for making saidwalls rigid with each other, sockets for guide rods being formed in saidbearing walls, vertical guide rods rigid in said sockets, a cross-headadapted to move on said guide rods, bearings in said cross-head, gearwheels and bearings in said gear wheels, removable bronze bushings insaid bearings, and pitman rods having bent ground journals engaging saidbearings for driving said crosshead, the centers of the bearings in saidcross-head being in, a vertical plane passing through the centers ofsaid gear wheels.

In testimony wh 'reof, I set my hand in the presence of two witnesses,this 19th day 7 of October, 1911.

FRED 1V. AXTELL.

Witnesses:

A. JOHNSTON, A. L. JACKSON.

